Method and apparatus for displaying a map

a map and display method technology, applied in the field of navigation apparatuses, can solve the problems of large capacity, large visibility and clearness of the screen, and disadvantageous display of realistic satellite pictures at a large map scale, and achieve the effects of increasing the level of emphasis, increasing the density of viewing angle regions, and high clearness

Active Publication Date: 2005-11-24
ALPINE ELECTRONICS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0018] In this navigation apparatus, the city lights appearing on the horizon of the bird's-eye view can be displayed for the individual portions of the horizon at respective emphasis levels in response to the building densities in the viewing

Problems solved by technology

In this method, when a satellite picture shot at nighttime is displayed during nighttime driving, a screen displaying an urban area is filled with light and appears white at a small map scale, thereby impairing visibility and clearness of

Method used

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  • Method and apparatus for displaying a map
  • Method and apparatus for displaying a map
  • Method and apparatus for displaying a map

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first embodiment

[0070]FIGS. 7A, 7B, 7C, and 7D illustrate typical navigation images according to the

[0071] The navigation image shown in FIG. 7A is drawn based on the town map data using the town-map color setting for daytime in acts S630, S632, and S634 in the map-drawing process under a condition that, in daytime, the map scale is not less than the threshold Th, and a town data group or town data groups are available for the map display area. FIG. 7B illustrates the navigation image when a map image is drawn based on the basic map data using the map color setting for daytime in acts S614, S616, and S618 in the map-drawing process under a condition that, in daytime, the map scale is less than the threshold Th. FIG. 7C illustrates the navigation image when a map image is drawn based on the town map data using the town-map color setting for nighttime in acts S630, S632, and S634 in the map-drawing process under a condition that, in nighttime, the map scale is not less than the threshold Th, and a to...

second embodiment

[0089] In the second embodiment, there are five light-spot-symbol generation modes. In a first mode, a light spot symbol is generated as a bright dot on a point within a building symbol such as the center of mass of the building symbol, as shown in Part b2 of FIG. 4. In a second mode, light spot symbols are generated as bright dots on some or all of vertexes of a building symbol, as shown in Part c2 of FIG. 4. In a third mode, a light spot symbol is generated as a bright outline of a building symbol, as shown in Part d of FIG. 4. In a fourth mode, a light spot symbol is generated as a building symbol. The outline of this building symbol and part of the area within the building symbol are drawn in a bright color, as shown in Part e of FIG. 4. In a fifth mode, a light spot symbol is generated as a building symbol. The overall building symbol is drawn in a bright color, as shown in Part f of FIG. 4.

[0090] The evaluated value is ranked into the first grade (highest) to the fifth grade (...

third embodiment

[0096] In the map-drawing process the navigation-image generating unit 105 generates the map image 912 including the bird's-eye view image 910 and the background image 911 representing the sky above the horizon including the water horizon, as shown in FIG. 9C.

[0097]FIG. 10 is a flowchart illustrating the map-drawing process according to the third embodiment. In act S1002, the navigation-image generating unit 105 retrieves a map display area for a bird's-eye view designated by the main controlling unit 107. This map display area covers an area 1101 having a trapezoid-shape, as shown in FIG. 11A. The upper edge of the trapezoid corresponds to that of a map image to be displayed. Then, in act S1004, the navigation-image generating unit 105 determines whether it is daytime or nighttime. When it is daytime, the process proceeds to act S1014 where the navigation-image generating unit 105 draws a predetermined daytime background, for example, an image representing the sky, on the upper po...

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Abstract

A navigation apparatus for displaying a map that includes building symbols representing buildings. The navigation apparatus includes a map-drawing unit that draws the map of an area from map data on shapes and positions of the building symbols at a selected map scale and a displaying unit that displays the drawn map. In the navigation apparatus in a nighttime-map displaying mode, the map-drawing unit draws the entirety of each building symbol in a bright color to generate the map when the map scale exceeds a predetermined threshold and draws part of the building symbol in a bright color to generate the map when the map scale does not exceed the predetermined threshold.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to navigation apparatuses that are mounted in vehicles and that guide users driving vehicles, and relates to methods for displaying maps using the same. [0003] 2. Description of the Related Art [0004] A navigation apparatus mounted in a vehicle may guide a user driving a vehicle by receiving a user request for setting a destination, determining a recommended route to the destination, and displaying this route and a mark showing the current position on a map of an area including the current position. A known method for displaying a map in the navigation apparatus is disclosed in, for example, Japanese Unexamined Patent Application Publication No. 2000-283784. In this method, when the scale of the map is large, the map includes symbols showing, for example, roads and shapes of buildings. When the scale is small, the map includes symbols showing roads superimposed on a satellite geographic...

Claims

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Application Information

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IPC IPC(8): G09B29/00G01C21/00G01C21/36G06T11/60G08G1/0969G09B29/10
CPCG01C21/32G01C21/3682G01C21/3673G01C21/367G01C21/3867
Inventor KUROSAWA, TAKESHIYUASA, MIZUKI
Owner ALPINE ELECTRONICS INC
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